HK183396A - Circuit arrangement for reversing a magnetic field - Google Patents

Circuit arrangement for reversing a magnetic field

Info

Publication number
HK183396A
HK183396A HK183396A HK183396A HK183396A HK 183396 A HK183396 A HK 183396A HK 183396 A HK183396 A HK 183396A HK 183396 A HK183396 A HK 183396A HK 183396 A HK183396 A HK 183396A
Authority
HK
Hong Kong
Prior art keywords
diode
pct
magneto
variable switch
terminal
Prior art date
Application number
HK183396A
Inventor
Friedhelm Zucker
Original Assignee
Thomson Brandt Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of HK183396A publication Critical patent/HK183396A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/66—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will
    • H03K17/661—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to both load terminals
    • H03K17/662—Switching arrangements for passing the current in either direction at will; Switching arrangements for reversing the current at will connected to both load terminals each output circuit comprising more than one controlled bipolar transistor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G11B11/10508—Recording by modulating only the magnetic field at the transducer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10595—Control of operating function
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor

Abstract

PCT No. PCT/EP90/00297 Sec. 371 Date Jul. 19, 1991 Sec. 102(e) Date Jul. 19, 1991 PCT Filed Feb. 22, 1990 PCT Pub. No. WO90/10290 PCT Pub. Date Sep. 7, 1990.At magneto-optical recording- and reproducing equipment is provided an electromagnet, in order to be able to remagnetize the magneto-optical layer of a magneto-optical record in dependence of Bits to be stored. In order to achieve a fast and safe reversal of the magnetic field, two series circuits consisting of a first and a second diode (D1, D2), a series circuit consisting of a third and a fourth diode (D3, D4) and a DC-voltage source (U) are connected in parallel to each other. The common terminal (A) of the first and second diode (D1, D2) are connected via a coil (L) with the common terminal (B) of the third and fourth diode (D3, D4). The second diode (D2) is bypassed by a first variable switch (S1) and the fourth diode (D4) is bypassed by a second variable switch (S2). The terminal (A) of the coil (L) is connected via a third variable switch (S3) and the other terminal (B) via a fourth variable switch (S4) with one input of a current sensor (SF), whose other input is connected with the common connecting point of the first and third diode (D1, D3). The output of the current sensor (SF) is connected with the input of a control circuit (S), whose outputs (A1, A2, A3, A4) are connected with the control inputs of the variable switches (S1, S2, S3, S4). The diodes (D 1, D2, D3, D4) are polarized in blocking direction with the DC-voltage source (U).
HK183396A 1989-03-04 1996-10-03 Circuit arrangement for reversing a magnetic field HK183396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3907057A DE3907057A1 (en) 1989-03-04 1989-03-04 CIRCUIT ARRANGEMENT FOR REVERSING A MAGNETIC FIELD

Publications (1)

Publication Number Publication Date
HK183396A true HK183396A (en) 1996-10-11

Family

ID=6375582

Family Applications (1)

Application Number Title Priority Date Filing Date
HK183396A HK183396A (en) 1989-03-04 1996-10-03 Circuit arrangement for reversing a magnetic field

Country Status (12)

Country Link
US (1) US5220467A (en)
EP (1) EP0461132B1 (en)
JP (1) JP2807082B2 (en)
KR (1) KR0168847B1 (en)
CN (2) CN1020013C (en)
AT (1) ATE93079T1 (en)
AU (1) AU5109590A (en)
DE (2) DE3907057A1 (en)
DK (1) DK0461132T3 (en)
ES (1) ES2044563T3 (en)
HK (1) HK183396A (en)
WO (1) WO1990010290A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838858A1 (en) * 1988-11-17 1990-05-23 Thomson Brandt Gmbh CIRCUIT ARRANGEMENT FOR REVERSING A MAGNETIC FIELD
DE4103777A1 (en) * 1991-02-08 1992-08-13 Mueller A & K Gmbh Co Kg OWN MEDIUM-OPERATED, VALVE CONTROLLED BY A BISTABLE SOLENOID VALVE FOR LIQUID AND GASEOUS MEDIA
US5587851A (en) * 1991-12-24 1996-12-24 Sharp Kabushiki Kaisha Magnetic head driving device with prerecording energization
US5404342A (en) * 1992-01-16 1995-04-04 Sony Corporation Magnetic head device for magneto-optical disc system and magnetic head driving circuit
JP2976697B2 (en) * 1992-05-29 1999-11-10 松下電器産業株式会社 Modulated magnetic field generator for magneto-optical disks
JP3098896B2 (en) * 1992-06-23 2000-10-16 キヤノン株式会社 Magneto-optical recording device
JP3211999B2 (en) * 1992-06-26 2001-09-25 キヤノン株式会社 Magneto-optical recording device
JP3365435B2 (en) * 1993-06-23 2003-01-14 キヤノン株式会社 Magneto-optical recording device
JP2976923B2 (en) * 1997-04-25 1999-11-10 日本電気株式会社 Drive device for capacitive loads
DE19747033A1 (en) * 1997-10-24 1999-04-29 Daimler Chrysler Ag Electronic switching device for magnets, esp. electromagnetic valve control elements for an internal combustion engine
DE19830772A1 (en) * 1998-07-09 2000-01-13 Bosch Gmbh Robert Bus-operated sensor device and corresponding test method
CN101588116B (en) * 2008-05-21 2013-01-02 孙立蓉 Magnetic suspension wind power generator
KR101285110B1 (en) * 2012-02-08 2013-07-17 김종훈 Low frequency magnetic wave generation apparatus for eco healing
KR101516735B1 (en) * 2013-06-25 2015-05-04 신명섭 A Multipurpose Rotation Structure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3037305C2 (en) * 1980-10-02 1986-04-03 Flowtec AG, Reinach, Basel Arrangement for generating constant magnetic fields of alternating polarity for magnetic-inductive flow measurement
JPH0619863B2 (en) * 1984-06-13 1994-03-16 株式会社日立製作所 Magneto-optical information storage method and device
JPS6161626U (en) * 1984-09-28 1986-04-25
GB8530930D0 (en) * 1985-12-16 1986-01-29 Mansfield P Inductive circuit arrangements
ES2043789T3 (en) * 1987-10-14 1994-01-01 Philips Nv MAGNETO-OPTICAL RECORDING DEVICE AND ENERGY CIRCUIT FOR USE IN A MAGNETO-OPTICAL RECORDING DEVICE.
FR2632438A1 (en) * 1988-06-07 1989-12-08 Philips Nv MAGNETO-OPTICAL RECORDER WITH MAGNETIC FIELD MODULE
FR2647940B1 (en) * 1989-06-02 1994-03-04 Thomson Csf MAGNETIC FIELD MODULATION CONTROL CIRCUIT FOR THE RECORDING OF A MAGNETO-OPTICAL MEMORY

Also Published As

Publication number Publication date
EP0461132B1 (en) 1993-08-11
CN1020013C (en) 1993-03-03
JPH04504022A (en) 1992-07-16
US5220467A (en) 1993-06-15
KR920700450A (en) 1992-02-19
CN1054684A (en) 1991-09-18
CN1054864A (en) 1991-09-25
EP0461132A1 (en) 1991-12-18
WO1990010290A1 (en) 1990-09-07
DK0461132T3 (en) 1993-10-18
ATE93079T1 (en) 1993-08-15
AU5109590A (en) 1990-09-26
ES2044563T3 (en) 1994-01-01
DE59002336D1 (en) 1993-09-16
JP2807082B2 (en) 1998-09-30
DE3907057A1 (en) 1990-09-13
KR0168847B1 (en) 1999-03-20

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20090222